HUUM HIVE Flow Wood Burning Sauna Stove User Manual

: September 13, 2024
: HUUM

Table of Contents

HUUM HIVE Flow Wood Burning Sauna Stove
GENERAL
INSTALLATION
SAUNA ROOM
USE
MAINTENANCE
REMOVAL FROM USE
SOLVING PROBLEMS
WARRANTY
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HUUM HIVE Flow Wood Burning Sauna Stove

HIVE Flow

SAUNA STOVE
Installation and operation manual

HUUM HIVE Flow sauna stoves include:

sauna stove heated by firewood;
metal grate;
sauna stove installation and operational manual;
heat resistant glove;
splints;
metal fixing plates (2 pcs);
ash grate;
cleaning hatches (2 pcs);
ash drawer.

Spare parts article numbers can be found in the Appendix 4 and 5
ATTENTION! A sauna stove needs stones. We recommend using HUUM 5-10cm sauna stones .
ATTENTION! Only the specialist of the relevant field may connect the wood- burning sauna stove described in the manual to the chimney.

GENERAL

Thank you for choosing HUUM Flow. You have choosen a unique sauna stove that is the cleanest woodburning stove on the market. You will not just have an unforgett able sauna experience, but also keep the enviroment clean.
For an optimal and safe sauna experience, it is strongly recommended to review the operation manual and retain it for future consultation.
The latest operation manual can always be found on HUUM’s website: huum.eu

Figure 1. Dimensions of the HIVE Flow sauna stove. Figure 2. Dimensions of the HIVE Flow LS sauna stove.

The operation manual contains technical data for the sauna stove as well as instructions for installation, operation, and maintenance.
The product is intended solely for use as a sauna stove.
Changing the construction of the sauna stove is strictly prohibited and may result in serious malfunction. It will result in termination of the warranty.
Use only HUUM spare parts off ered by the manufacturer.
Changing or removing the data label att ached to the sauna stove is prohibited.
The technical data of the sauna stove has been provided in Appendix 1.
Figure 3. Dimensions of the HIVE Flow Mini sauna stove.
Figure 4. Dimensions of the HIVE Flow Mini LS sauna stove.

INSTALLATION

All relevant local regulations should be followed when installing the sauna stove, including those referring to country specific standards and European standards.
Before installing and using the sauna stove, thoroughly review the requirements for installing the sauna stove in the sauna room. If you have questions or to obtain additional information, be sure to contact the local or national fire safety agency or consult an authorized specialist.
Before installation, make sure the power rating of the stove corresponds to the volume of the sauna room. The suitable cubic capacity of the sauna room has been provided in Appendix 1. If there are uninsulated brick, tile or glass walls in the sauna room, an additional sauna room volume of 1 m3 should be calculated for each square meter of such a wall.
The maximum room size where this stove is allowed to be installed has been presented according to the methodology provided in standard EN15821:2010.

ATTENTION! The manufacturer’s warranty is void if the capacity of the sauna stove does not correspond to the volume of the sauna room, non-insulated surfaces are not taken into account and/or there is insufficient ventilation in the sauna.

See more about best practices for sauna construction

PRE-INSTALLATION HEATING
ATTENTION! Before installation, the sauna stove must be heated outdoors at least once while following general fire safety precautions. This is necessary as the protective paint layer of the body of the sauna stove emits harmful and
unpleasant-smelling fumes during the first heating. The paint gains durable properties during the first heating.

Heat the sauna stove in well-ventilated outdoor area that is sheltered from the wind. This will enable the stove surfaces heat up evenly.

Before heating for the first time, be careful not to scratch the surface of the sauna stove.
Remove the stone grate for pre-installation heating.
Do not lay stones on the body of the sauna stove.
Do not throw water on the sauna stove during first heating.
1-2 hearths of firewood is enough for the first heating.
You can stop heating when no visible smoke or steam is released from the surface of the stove.
During the pre-installation heating, keep the door slightly open. Do not close the door at any stage during the first heating. (See Figure 6.)

ATTENTION! The door seal may stick to the heater body and detach!

To improve draft, you can use flue pipes used in final installation.

BASE SURFACE
The sauna stove is installed in the sauna room to the floor of non-combustible material with sufficient load-bearing capacity. The concrete floor with the thickness of at least 50 mm is suitable.
If the fl oor heating cables or pipes are located under the sauna stove, the thermal plate for HUUM sauna stoves or other non-combustible material and additional protection with suff icient thickness and load-bearing capacity should be used to protect these from heat radiation.

In case of the floor made of combustible material, it is mandatory to use the thermal plate for HUUM sauna stoves or some other non-combustible material and additional protection with sufficient thickness and load-bearing capacity. The ventilation gap of at least 30 mm is mandatory between such a base and the floor, so that air can move freely.

SAFETY DISTANCES

Table 1.| Room

m3

| Weight

kg

| Quantity of stones

kg

| A

mm

| B

mm

| C

mm

---|---|---|---|---|---|---
Flow| 8-18| 67| 150| 150| 500| 826
Flow LS| 8-18| 73| 150| 150| 500| 826
Flow Mini| 6-14| 54| 105| 150| 500| 750
---|---|---|---|---|---|---
Flow Mini LS| 6-14| 59| 105| 150| 500| 750

There should be at least 50 mm between the wall of non-combustible material and the stove.

Safety distances can be reduced by using protective screens made of non- combustible material. The single-layer light protective screen allows to reduce the safety distances by 50% and the double light protective screen by up to 75%.

The protective screen is included in the safety distance, which means that the distance is measured to the flammable material, not to the protective screen. There should be a gap of at least 50 mm between the protective screen and the sauna stove.
The safety distance between the sauna stove and the ceiling can be reduced by 25% by using the single protective screen. The double protective screen is not used in the ceiling.

The single light protective screen is made of at least 7 mm thick non- combustible, fibre-reinforced cement board or of at least 1 mm thick metal plate, which is firmly attached to the wall. An air gap of at least 30 mm should remain between the surface to be protected and the protective screen.

The double protective screen can be made of the same materials as mentioned above. There should be an air gap of at least 30 mm between the protective screen and the wall. There should be an air gap of at least 30 mm between the protective screen and the floor and ceiling to ensure adequate air circulation.

ATTENTION! Before reducing the safety distance, please check the local safety laws and regulations in your country.
When installing flues, the safety distances specified in the instruction manual of the respective manufacturer should be followed.

To protect flooring made of combustible material in front of the sauna stove, the sheet metal plate should be attached to the floor in front of the stove, which extends at least 100 mm beyond the sides of the door opening of the stove, and at least 400 mm in front of the stove. The edge of the plate closest to the stove side should be bent up so that the coal falling from the sauna stove does not get under the stove.

The minimum dimensions for the non-combustible wall and the opening in the case of HIVE Flow LS are provided in Table 2. For HIVE Flow Mini LS, see Table 3.

Table 2.| A

mm

| B

mm

| C

mm

| D

mm

---|---|---|---|---
Sauna stove on the ﬂoor,

without mounting collar.

| 650| 1050| 320| 470
Sauna stove on the ﬂoor,

with HUUM mounting collar.

| 650| 1050| 485| 560
Sauna stove on protective bedding, with HUUM

mounting collar.

|

650

|

1100

|

485

|

615

Table 3.| A

mm

| B

mm

| C

mm

| D

mm

---|---|---|---|---
Sauna stove on the ﬂoor,

with no mounting collar

| 650| 1050| 270| 470
Sauna stove on the ﬂoor,

with HUUM mounting collar.

| 650| 1050| 435| 560
Sauna stove on protective bedding, with HUUM

mounting collar.

|

650

|

1100

|

435

|

615

The protective bedding and mounting collar are accessories designed to simplify installation and add fi nishing touches. These items are sold separately. The maximum thickness of the non-combustible wall when using HUUM mounting collars is up to 150mm, and without it up to 100mm. Please refer to Appendix 5 for more details.

CONNECTION TO THE FLUE
ATTENTION! The connection between the sauna stove and the flue can only be made by a certified installation expert.

The flue (chimney) must comply with the specifications provided in Appendix 1.
HIVE Flow sauna stove can be connected to the flue both from the top and back of the sauna stove. To connect from the back, the positions of the bolted chimney leg and cover plate should be changed.

Figure 10. HIVE Flow back connection. The two ribs should be cut according to the diameter of the chimney element and the loose ends of the ribs should be fixed with the metal fixing plates found in the package.

To connect the sauna stove to the flue, only flue pipes approved by the local fire and safety regulations should be used. HUUM offers standard chimney sets, the details of which can be found in Appendix 5.
The joints of the chimney system should be sealed using the special heat-resistant rope and/or stone wool.
When installing flues, the safety distances specified in the respective manufacturer’s instructions should be followed

The average and maximum flue gas temperature of the sauna stove heated according to the manual is below 400°C. Therefore, the sauna stove can be connected to an existing flue gas system that already has a fireplace connected.

ATTENTION! Be sure to coordinate this with the local government and rescue board / fire department in advance, as requirements may vary from region to region.

SAUNA ROOM

WALL MATERIALS AND INSULATING OF THE SAUNA ROOM

In a sauna, all heat accumulating wall surfaces (glass and concrete walls, brick, plaster, etc.) should be insulated in order to use the woodburning stove with optimal output. This prevents heat loss in the sauna room and overheating of the stove.

The following sauna construction guidelines can help ensure a well-insulated sauna room:

An insulation layer of 50-100mm thickness is installed (foam insulation boards covered with a vapour barrier foil suit well).
Aluminium foil or other reflective material on top of the insulation material without a vapour barrier. The joints are covered with foil tape.
10mm ventilation gap (recommended) is left between the moisture barrier and the lining board with spacers.
12-16 mm wooden lining board is suitable for interior finishing. Before installing the lining boards, check for power cables and reinforcements in the walls that are necessary for equipment installations, e.g. a sauna bench.
To prevent moisture from the floor, the distance between the board and the floor should be at least 100 mm.
There is a minimum ventilation gap of 5 mm between the wall and ceiling board.
Wooden sauna surfaces can be coated with sauna wax or oil to prevent dirt being absorbed into the wood.

Ceiling of the sauna room
To optimize the sauna stove’s output, the recommended height of the sauna room is 2000 – 2300 mm. In case of a higher sauna room, it is advisable to lower the ceiling, thus reducing the volume of the sauna room.

The minimum permissible height of the sauna room for HUUM Flow sauna stove is 1900 mm.
The distance between the top step of the sauna bench and the ceiling should be between 1100 and 1300 mm.
The ceiling of the sauna room should be insulated in the same specification as the walls.

ATTENTION! When covering the walls or ceiling with heat protection (e.g. with mineral tiles), a sufficient ventilation gap should be left between the materials. Installing tiles directly on a wall or ceiling surface can cause dangerous overheating of wall and/or ceiling materials.

ATTENTION! Check with your local authorities responsible for fire safety regarding parts of the firewall can be insulated. It is forbidden to insulate flues in use.

DARKENING OF THE SAUNA ROOM WALLS
Over time, the wooden materials used in the sauna room may begin to darken due to the high temperature. This is a natural process that does not pose a risk and is usually caused by the darkening of the wood or the wood protection product used.
The darkening process can also be caused by the fine stone dust, breaking away from the sauna stones and lifted up by the airflow. By following the manufacturer’s instructions when installing the sauna stove, flammable materials in the sauna room may not become dangerously hot.

ATTENTION! The highest allowed temperature for the wall and ceiling surfaces of the sauna room is 140˚C.

FLOOR OF THE SAUNA ROOM
Due to large changes in temperature, the sauna stones may crumble over time. Together with the sauna water, particles released from the stones and fine stone dust are washed onto the sauna floor. Hot stone chips can damage plastic covered floors under and near the sauna stove. The splashes of heating stones and sauna water
(especially for iron-rich water) can be absorbed into the caulking of the tile floor.
In order to avoid aesthetic damage, ceramic tiles and dark joint filler should be used under and around the sauna stove.

VENTILATION
The ventilation of the sauna room should be efficient enough to accommodate burning requirements (one kilogram of wood requires 6 – 10 m³ of oxygen-rich air to burn). The fresh incoming air should be directed as close to the sauna stove as possible. For a healthy and pleasant sauna experience, it is important that proper air circulation is ensured in the sauna room during sauna use. You can find instructions on the proper sauna ventilation solution on
HUUM’s website: huum.eu “HUUM Blog – Sauna ventilation” After using the sauna, the room should be ventilated to get rid of excess humidity.

ATTENTION! The use of forced ventilation can cause room air exchange problems and insufficient combustion air in the hearth. Before installing and using the sauna stove, make sure that the existing ventilation system allows the use of the hearth. If necessary, contact the HVAC engineer or sauna installer for more information.

. Figure 11. Gravity-based ventilatsion in a wood-fired sauna Figure 12. Mechanical ventilation in a wood-fired sauna

USE

LAYING OF STONES
We recommend using special HUUM sauna stones .
The stones found in nature may not be suitable for saunas, as these may crumble or/and release toxic chemicals.

Before laying the stones, we recommend washing the stones clean of dust under running water.
Before laying the stones, make sure that the cleaning hatches are securely in place.
The size and quantity of suitable stones for the sauna stove have been provided in Appendix 1.
HIVE Flow stone grate can be split. To insert and remove the lower stones, the upper part of the grate should be removed and raised as far as the chimney connection allows (Figure 13).
The stones should be laid evenly layer by layer. Do not push stones between the stone grate and the hearth with force.
Do not lay a high pile of stones, and make sure before the first use all stones are level with the top of the stone grate (Figure 14).

HEATING

ATTENTION! Before installation, the sauna stove must be heated outdoors at least once while following general ﬁ re safety precautions.

Before starting the heating, make sure that there are safety distances around the sauna stove and there are no fl ammable objects or materials on top of the sauna stove.
The sauna stove may only be heated with fi rewood. Both hardwood and softwood are suitable.
Do not exceed the maximum amount of fi rewood, in kilograms, as specifi ed in Figures 16 and Figure 17.
The optimum humidity of fi rewood is 10-15%. Very dry and fi ne fi rewood burn too intensively, thereby increasing the risk of overheating and excessive heating of the fl ues. Excessively moist wood burns poorly and tars the door and fl ues of
the sauna stove.
ATTENTION! The use of other fuels, including liquid fuels, is prohibited!
The most suitable fi rewood length is 30 cm. The maximum length of the log is 40 cm.
The fi rewood added to the hearth could be of the same size and thickness. In this way, combustion takes place most evenly.
The fi rewood weighing around 0.4 – 0.7 kg are most suitable for heating the sauna stove. Very thick fi rewood burns for a long time and the sauna takes longer to warm up. Very fi ne fi rewood burn too quickly, and the sauna stove and stones cannot store the heat.
ATTENTION! It is forbidden to cover the sauna stove!
If a water tank is installed on the fl ue pipe of the sauna stove, fi ll it with clean water before starting the heating.
Make sure that the ash grate is not blocked, clean it with the fi re poker if necessary. Leave unburned coals from the previous time on the grate. Empty the ash drawer when it is more than half full.
Avoid ash and combustion residues entering the lower space of the hearth, under the ash drawer. If necessary, remove the ash drawer and clean.
To remove the ash drawer for emptying, open the hearth door, lift the ash drawer slightly and then pull it out (the ash drawer has a safety limiter that prevents it from being opened excessively during heating). See Figure 15.

ATTENTION! Ashes and coals should be completely extinguished and cooled before emptying the ash drawer into a fire resistent waste bucket or combustible material container.

Make sure there is a draft in the chimney. If in doubt, check the draft, by burning some paper in the hearth of the sauna stove.
The maximum quantity of firewood provided in Appendix 1 of the operation manual should not be exceeded. The firewood should not be added to the hearth of the sauna stove more often than the minimum intervals provided in Appendix 1. In case of very dry and also fine firewood, the amount of heating material should be reduced.

ATTENTION! Make sure you don’t overheat the sauna stove!
If the surface of the sauna stove turns red, it is overheating. In this case, immediately close the air valve at the bottom of the stove to reduce the intensity of the combustion. The manufacturer is not responsible for deformations and damages of the sauna stove that have occurred as a result of overheating.
The firewood to be inserted to the hearth should be weighed at least for the first few times of heating. Later, this process could be repeated from time to time, especially if you change the length or type of firewood. An ordinary bathroom scale is suitable for weighing firewood.

STARTING THE HEATING
The first batch should consist of medium-sized firewood and a small amount of fine chips. The maximum quantity of firewood in kilograms has been provided in Appendix 1

Lay the thinner firewood for the bottom layer.
Put the thickest ones as the middle layer.
Cover the middle layer with thin firewood with chips for kindling.
Place the firewood as far back as possible in the hearth, leaving about 10 mm of free space between the firewood and the back wall.
Lay the firewood tightly to the hearth, leaving air gaps between the firewood is not necessary.

Ignition should take place from the upper quarter of the heating material. It is convenient to use a fire starter (non-liquid) or birchbark for lighting.

ATTENTION! Never light the fire from the bottom!
This causes burning that wastes fuel and pollutes the environment. Also, both the stove and the chimney heat up more slowly and the heating process takes longer.

The air valve at the edge under the front part of the sauna stove should be fully opened. If the draft in the chimney is too big and the burning is very intense, the burning speed can be reduced by adjusting the air valve.
Keep the ash drawer open for up to 15 minutes after lighting. The ash drawer has a limiter that prevents it from being opened more than 3 mm.
The hearth door can be kept open for approximately 2 minutes after lighting. A few millimetres are enough. This reduces moisture condensation and soot sticking to the door glass.
No later than 15 min after lighting (or earlier, when combustion has reached good momentum), close the ash drawer completely (push the drawer in).
Leave it closed during the entire heating period, including when adding subsequent amounts of wood.

Removing the ash drawer during heating is prohibited. An open or missing ash drawer creates a risk of overheating and inefficient combustion.
ATTENTION! The manufacturer is not responsible for the consequences caused by overheating. An improperly heated sauna stove is not covered by the warranty.

CAUTION! The outer surfaces and stones of the sauna stove are very hot when using the stove! Do not touch!

ATTENTION! Do not open the stove door during the intense burning phase. If it is necessary for some reason, first open the door a few millimetres for 10 seconds. Then you can open the door as much as necessary. Otherwise, flames may shoot out of the hearth.

FILLING THE HEARTH DURING HEATING
Adding firewood only takes place when the first batch has burned out, i.e. the firewood is no longer burning and glowing coals have formed. Adding firewood too early reduces the efficiency of the stove

Choose equal-sized firewood for filling.
Fill the hearth with firewood to a maximum of 2/3 of its height.
Figure 16 and Figure 17 indicates the maximum number of firewood in kilograms for each filling procedure.
Mix the coals with the fire poker before adding the firewood.
Stack the firewood tightly to the hearth, as close to the back wall as possible.
Make sure the ash drawer is in the closed (fully pushed in) position.
Close the stove door.

If the second filling of the hearth is also necessary to reach the desired sauna temperature, repeat the same process.

ATTENTION! The ash drawer should always remain closed (except during the ignition phase).

MAKING STEAM
As the sauna heats up, the air in the sauna room becomes dry. To achieve a pleasant humidity level and the best sauna experience, throw water on the hot stove stones.

Start making steam only when the stones are properly hot and the water has completely evaporated from them.
Too hard and iron-rich water changes the appearance of sauna stones.
Do not use water containing salt or chlorine, as it causes corrosion of the body of the sauna stove.
We recommend throwing about 80 ml of water on the stones at a time. If you want more steam, wait a few minutes and then pour the same amount again. This allows the stones to dry out and reheat in between.
Aromatic liquids made of oil or any must substance should be diluted in steam water beforehand, otherwise these may catch fire in a hot sauna stove or on stones.
Pour water evenly over the stones.

ATTENTION! Never make steam when someone is in the immediate vicinity of the sauna stove, as the hot steam can cause burns.

FINISHING THE HEATING
Due to the special nature of combustion, a lot of coal is generated in the hearth. Depending on the number of firewood logs added to the sauna stove, the layer of embers formed in the hearth can burn for a long time.
If you want the coals to burn faster at the end of heating:

Mix the coals with a poker and pile them in the middle of the hearth.
Open the ash drawer as much as possible. The ash drawer’s safety limiter prevents the drawer from being opened more than 3mm. An inflow of air occurs through the ash grate and intensive burning of coal begins.

We recommend scheduling the sauna session in the same time period when the coals are burning in the hearth. This way, you will save fuel and have a better sauna experience. When the coals are finised burning, close the ash drawer and
the air valve located under the stove door, so the stove stays warm longer.

MAINTENANCE

The stove properly heated with high-quality fi rewood does not create soot in the fl ues and does not require special maintenance. However, the chimney, connections of the fl ue pipes with the chimney and the fl ues of the sauna stove should be cleaned at least once a year. This work should be ordered as a service from a qualifi ed chimney sweep. When cleaning the sauna stove, you should observe all local fi re and safety regulations that stipulate the fi re safety requirements for cleaning heating equipment (RTL 1998,195/196, 771 and RTL2000,99,1555).

The fl ues of the sauna stove are cleaned at least once a year. To do this, the upper stone layer should be removed from the stove so that access to the cleaning hatches is possible. If soot is visible inside the sauna stove, the fl ues should be swept.
Every qualifi ed chimney sweep has the appropriate equipment for this.
Also, check the condition of the stones in the sauna stove at least once a year.

Replace any cracked or otherwise damaged stones with new ones. Depending on the intensity of sauna use, it is necessary to partially or completely replace the stones with new ones on average every two years. When the stones that have outlived their time, heating takes longer, which in turn puts more strain on the structure of the sauna stove, wastes heating material and reduces the quality of the steam.

Clean the door glass regularly, preferably before each heating. Special fi replace glass cleaners sold in stores are suitable for cleaning. You can also use moistened kitchen paper towels. Dip the moistened paper towel in fi ne white ash in the hearth and scrub away the soot deposited on the door. Then clean and dry the glass with a clean paper.

Check the condition of the door seal every time you clean the glass. If the door seal is damaged or comes loose, the sauna stove should not be heated. Without a seal, the combustion process receives too much air and can cause overheating. The door seal can be replaced. You can order a suitable seal and glue as HUUM’s spare parts.

REMOVAL FROM USE

HUUM sauna stoves are designed to last with the aim of leaving the smallest possible ecological footprint on the environment.
When the sauna stove has served its time, take it and the related parts to a designated collection point for disposal in accordance with local legal regulations.

General instructions for removal of the sauna stove from use:

Clean the hearth and flues of the sauna stove.
Disconnect the sauna stove from the chimney flues and close them.
Take the metal structures of the sauna stove to the designated collection point (e.g. designated metal recycling center).
Take the glass parts of the sauna stove to the designated collection point (e.g. designated waste center).

WARNINGS AND NOTES

The sauna stove is designed to heat the sauna room to the temperature of enjoying steam. It should not be used for any other purpose.
Do not heat the sauna stove if you do not have sufficient knowledge or if your state of health does not allow it to be done correctly.
Due to the large stone mass of the sauna stove, it takes time to reach the desired temperature in the sauna room. Allow for time for the sauna stove to reach optimal temperature according to the operation manual. If you try to rush the heating by ignoring the rules of use, it leads to overheating, damage to the sauna stove and flues, and the risk of fire. The properly heated sauna stove stores heat for a long time and creates mild steam.
The best sauna room temperature for enjoying steam is 60 – 80 °C.

Minors are not allowed to heat or use the sauna stove without adult supervision.
Do not leave the sauna stove unattended in burning mode.
The sauna stove can only be used when properly filled with stones.
It is forbidden to cover the sauna stove, it causes a fire hazard.
Do not touch the heated sauna stove, it will cause burns.
The air valve and ash drawer become hot during heating. Use gloves or a fire poker to handle these.
If the sauna stove overheats or other problems occur (e.g. soot fire in the flue), stop the burning process immediately. To do this, make sure that the ash drawer is closed and close the air valve at the edge under the sauna stove. If possible, limit the air supply to the sauna room. In case of a soot fire, be sure to have the chimney sweep clean the flue before the next use and check the condition of both the flue and the sauna stove.
Avoid getting water on the hot door glass of the sauna stove! Tests have shown that the door glass of the sauna stove is durable, but the manufacturer’s warranty does not apply to the glass. If the door glass is broken, order a replacement glass as a HUUM spare part.
ATTENTION! Heating the sauna stove with cracked glass is prohibited!
If the sauna stove has not been used for a long time, make sure that both the sauna stove and the flue are in good condition before heating.
To clean the hearth and use it safely, stock up on handy hearth accessories for the sauna room (scoop, brush, poker). Store these in a lower temperature (up to 40 °C) part of the sauna room (e.g under the sauna bench).
Changing or rebuilding the structure of the sauna stove is prohibited.

SOLVING PROBLEMS

The draft of the sauna stove is weak

The sauna stove has not been used for a long time and the flue and stones are damp.
The sauna stove does not get enough air or there is underpressure in the sauna due to ventilation. Underpressure can be caused, for example, by using a kitchen hood.
The sauna stove has not been cleaned for a long time.
Leakage in the connection pipe.

The sauna is not heating up properly

Firewood is damp or too thick.
The power of the sauna stove does not correspond to the cubic capacity of the room.
The draft of the sauna stove or flue is weak.
The sauna stones are dirty, crumbled. Inappropriate stones have been used.
Structural and ventilation errors in the sauna.

The sauna stove creates an unpleasant odor

Pre-installation heating has not been done
The sauna stones have not been washed before installation.
Grease or dirt has accumulated on the stones.
Steam water is not clean.

The sauna stove is overheating

The ash drawer is open during heating.
The chimney draft is too big.
Firewood is too thin and/or dry.
The amounts and intervals of batches are incorrect

The oven glass is getting sooty

Sooting of the glass during oven ignition is normal. It is caused by humidity in the air and cold surfaces where water condenses. When starting the heating, keep the door slightly open by a couple of millimeters for the first few minutes to allow the surfaces to dry, and then close the door completely.
The wood used for heating is too moist. If possible, store/dry the wood indoors.

A flame shoots out when opening the door of the stove.

Do not open the stove door during the intense burning phase. If it is necessary for some reason, first open the door a few millimetres for 10 seconds. Then you can open the door as much as necessary.

WARRANTY

General provisions:

The purchaser is obliged to review the product operation manual and follow the requirements stated in the operation manual.
The warranty is valid if the product has a technical defect or error caused by the manufacturer.
The warranty includes the replacement of parts with product or manufacturing defects.
The length of the warranty period is 5 years from the date of purchase of the product for the private use and 1 year for public use..
The warranty does not extend to failures due to non-compliance with the rules of use given in the manual.

ATTENTION! The warranty is based on the presentation of the purchase receipt/invoice. The right to submit a claim is valid on the condition that the product has been used only for the intended purpose and conditions.

Terms of warranty:

The warranty does not cover the defects caused by normal wear and tear of the product.
The warranty does not apply to the stove door glass.
The warranty does not apply to sauna stones.
Door and glass seals: 2 years for private use, 1 year for public use.

The warranty does not cover failures caused by:

Product transportation and other accidental damage;
Careless or unintended storage and use of the product and from overloading.
Non-compliance with the product installation and operation instructions and safety requirements.

The warranty is not valid as follows:

The manufacturer is not responsible for the consequences caused by overheating and the warranty does not extend to an improperly heated sauna stove.
If the product has been repaired by an unauthorized person, the parts that do not belong to the product have been added or the consumables not accepted by the manufacturer have been used.
The set of the product is not complete.

Find the most up-to-date information on our website: huum.eu

APPENDIX 1 TECHNICAL DATA OF THE SAUNA STOVE

| Flow| Flow LS| Flow Mini| Flow Mini LS
---|---|---|---|---
Size of the sauna room m3| 8..18| 8..18| 6..14| 6..14
Height from the floor mm| 884| 884| 884| 884
Width mm| 526| 526| 450| 450
Depth (without handle) mm| 586| 706| 493| 613
Chimney leg diameter mm| 114| 114| 114| 114
Chimney temperature class| T450| T450| T450| T450
Minimum cross-section of the chimney mm2| 10 400| 10 400| 10 400| 10 400
Weight without stones kg| 67| 73| 54| 59
Weight of heating stones kg| 150| 150| 105| 105
Stone size mm| 50..150| 50..150| 50..150| 50..150
Fuel| firewood| firewood| firewood| firewood
Maximum length of firewood mm| 400| 400| 300| 300
Recommended length of firewood mm| 300| 300| 300| 300
Ignition quantity maximum kg| 5| 5| 3,8| 3,8
Minimum burning time of the ignition

quantity in minutes

| 75| 75| 65| 65
First reheating quantity maximum kg| 2,2| 2,2| 1,8| 1,8
Minimum burning time of the first

reheating quantity in minutes

| 35| 35| 35| 35
Second reheating quantity maximum kg| 1,8| 1,8| 1,4| 1,4
Maximum fuel quantity per hour kg/h| 4| 4| 3,5| 3,5
Nominal heating capacity KW| 9,8| 9,8| 8,5| 8,5
Gross efficiency %| 74,9| 74,9| 75,1| 75,1
Average flue gas temperature at nominal

heating capacity °C

| 339| 339| 319| 319
Maximum flue gas temperature at nominal

heating capacity °C

| 385| 385| 343| 343
CO (13% O2) mg/m3| 346| 346| 686| 686
PM (13% O2) mg/m3| 17| 17| 14| 14
NOX (13% O2) mg/m3| 68| 68| 81| 81
OGC (13% O2) mg/m3| 34| 34| 51| 51
Flue gas mass flow g/s| 8,6| 8,6| 7,9| 7,9

APPENDIX 2 DECLARATION OF HIVE FLOW PERFORMANCE

EN 15821:2010

Wood-burning sauna stoves with reheating for heating rooms in residential buildings.

• Sauna stove HIVE Flow

• HIVE Flow LS

BImSchV Stufe 2 01/26/2010 DIN EN 13240 ECODESIGN 2022 2015/1185

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HUUM OÜ

Vahi tee 9

60534 Vahi küla Tartumaa Estonia

Fire safety| Compliant with requirements

Safety distances